rtc: gemini: Add optional clock handling

This makes the Gemini optionally take two clock references to
the PCLK and EXTCLK. As we are adding a clock framework to the
Gemini platform we need to make sure that we get the right
references.

Acked-by: Hans Ulli Kroll <ulli.kroll@googlemail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

diff --git a/drivers/rtc/rtc-gemini.c b/drivers/rtc/rtc-gemini.c
index 5279390..cf766e0 100644 (file)
--- a/drivers/rtc/rtc-gemini.c
+++ b/drivers/rtc/rtc-gemini.c
@@ -26,6 +26,7 @@
 #include <linux/platform_device.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
+#include <linux/clk.h>
 
 #define DRV_NAME        "rtc-gemini"
 
@@ -38,6 +39,8 @@ struct gemini_rtc {
        struct rtc_device       *rtc_dev;
        void __iomem            *rtc_base;
        int                     rtc_irq;
+       struct clk              *pclk;
+       struct clk              *extclk;
 };
 
 enum gemini_rtc_offsets {
@@ -127,6 +130,27 @@ static int gemini_rtc_probe(struct platform_device *pdev)
                return -ENOMEM;
        platform_set_drvdata(pdev, rtc);
 
+       rtc->pclk = devm_clk_get(dev, "PCLK");
+       if (IS_ERR(rtc->pclk)) {
+               dev_err(dev, "could not get PCLK\n");
+       } else {
+               ret = clk_prepare_enable(rtc->pclk);
+               if (ret) {
+                       dev_err(dev, "failed to enable PCLK\n");
+                       return ret;
+               }
+       }
+       rtc->extclk = devm_clk_get(dev, "EXTCLK");
+       if (IS_ERR(rtc->extclk)) {
+               dev_err(dev, "could not get EXTCLK\n");
+       } else {
+               ret = clk_prepare_enable(rtc->extclk);
+               if (ret) {
+                       dev_err(dev, "failed to enable EXTCLK\n");
+                       return ret;
+               }
+       }
+
        res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
        if (!res)
                return -ENODEV;
@@ -156,6 +180,10 @@ static int gemini_rtc_remove(struct platform_device *pdev)
 {
        struct gemini_rtc *rtc = platform_get_drvdata(pdev);
 
+       if (!IS_ERR(rtc->extclk))
+               clk_disable_unprepare(rtc->extclk);
+       if (!IS_ERR(rtc->pclk))
+               clk_disable_unprepare(rtc->pclk);
        rtc_device_unregister(rtc->rtc_dev);
 
        return 0;